Sound funnel for radiotelephony or other sound reproduction



June 8 1926. 1,587,587

G. K. V. JURGENSEN SOUND FUNNEL FOR RADIO TELEPHONY OR OTHER SOUNDREPRODUC'IHON Filed Jan; 27, 1925 INVENTOK: G Kar/o V/l/ 4E7 ease/7ATTOR NET Patented June 8, 1926.

UNITED STATES PATENT OFFICE.

GEOBG KABLO VILLY JORGENSEN, 0F COPENHAGEN, DENMARK.

SOUND FUNNEL FOB Application filed January 27, 1925,

The invention relates to a sound-funnel for radio-telephony or othersound-reproduction. The distinguishing feature of the invention is thatthe sound-funnel is formed of two layers of wood with an interposedhelically wound steel wire (piano wire) by means of which the partscomposing the inner layer of wood are bound tightly together. Hereby theadvantages are attained partly that the sound funnel is reinforced so asto become more solid and durable, partly that the reproduction of soundbecomes exceedingly pure, clear and distinct and especially free of alldisturbing secondary sounds.

In the drawing accompanying and form ing part of this Fig. 1 showsvation with the outer removed, and I Fig. 2 a section along the lineII--II in Fig. 1 to a larger scale.

The sound-funnel is layer of thin strips a, for instance eight strips,in such a manner that the soundfunnel will be of octagonalcross-section. Bending of the wooden strips and gluing together of theiredges is effected in known manner by use of a core corresponding to theshape of the sound-funnel desired. After bending and luing of the innerlayer of strips has been nished the funnel thus formed is wrapped with asteel wire (piano wire) 7), the winding beginning at the narrow end ofthe funnel and being continued with one single unbroken wire laidhelically with suitable pitch throughout the entire specificationthesound-funnel in side elelayer of wood partly formed by an innerBADIOTELEPHONY OR OTHER SOUND REPRODUCTION.

Serial No. 5,024, and in Denmark December 2, 1924.

length of the funnel clear up to the funnel mouth. The steel wire iswound quite tightly about the funnel in such a manner 42s that it cutsinto the edges of the funnel, whereby it is held securely in position onthe funnel. When the winding operation is finished, an outer layer ofthin wooden strips 0, suitably of the same thickness as 45 the innerlayer of strips a. The strips 0 are attached by gluing to the innerlayer.

Experiments have shown that the wrapping of fine steel wire about theinner funnel portion causes the sound reproduction 5 to be far betterthan if no such wrapping were provided.

The same manufacturing process may also be used in other fields whereboxshaped, tubular or otherwise shaped wooden articles are produced.

Having thus described my what I claim is 1. Sound-funnel forradiotelephony and other sound reproduction, comprising an inner and anouter layer of wood, metal wire wrapped around said inner layer, andmeans for connecting said outer layer to the inner layer.

2. Sound-funnel for radiotelephony and other sound reproduction,comprising an inner and an outer layer of wood, and metal wire wrappedaround said inner layer, the outer layer being connected with the innerlayer by means of glue.

In testimony whereof I have signed my name to this specification.

invention,

GEORG KARLO VlLLY JORGENSEN.

